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energy Flashcards

(24 cards)

1
Q

kinetic energy

A

KE = 1/2 mv ^2

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2
Q

potential energy (Gravitational)

A

MGH

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3
Q

Total Energy

A

PE +KE

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4
Q

conversion energy

A

energy can not be created or destroyed, only transferred

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5
Q

two types of energy

A

kinetic and potential energy
kinetic is when a object is in motion while potential is a object that has the ‘potential to move’
ex: Ball on the top of the hill or ball rolling down hill

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6
Q

4 forms of energy

A

Mechanical energy - results from movement or the location of an object. (sum of KE and PE)

Chemical energy - energy stored in the bonds of atoms and molecules

Electrical energy - related to forces and movements on electrically charged particles and the movement of those particles

thermal energy - heat generated from friction (the faster, the more heat energy is released)

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7
Q

how are kinetic energy and power related?

A

change in kinetic energy = work and power = work/time, so power is change in kinetic energy/time

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8
Q

work energy theorem

A

theorem states that energy is the ability to do work and network done on a system is = change in kinetic energy on a system network causes a change in the kinetic energy of the object.

formula for net work:
net work = change in kinetic energy = final kinetic energy - initial kinetic energy.

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9
Q

kinetic energy

A

energy of motion

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10
Q

potential energy

A

stored energy

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11
Q

work

A

force moved through distance

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12
Q

energy

A

the ability to do work

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13
Q

power

A

amount of work done per unit of time

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14
Q

conservation of energy

A

energy cannot be created nor destroyed

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15
Q

displacement

A

difference between the origin and endpoint

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16
Q

newton

A

SI Unit of force

17
Q

joule

A

SI unit of energy

18
Q

efficiency

A

work output per work input

19
Q

formula for potential energy

A

mass x meters = (PE) J

20
Q

formula for power

A

joules/time = (P) j/s

21
Q

formula for kinetic energy

A

1/2 (mass)(velocity) to the power of 2 = (KE) KGM/S

22
Q

FORMULA FOR WORK

A

1/2 (mass)(METERS) to the power of 2 = (W= CHANGE IN KE) KGM/S

23
Q

POTENTIAL INTO KINETIC FORMULA

A

J (new time/initial time) = J

24
Q

potential energy of 130000 joules, if it takes 6 seconds to reach water, what is the energy after only 3